不用第三个变量交换值的五个办法
不用第三个变量交换值的五个办法

package com.kevin.demo;/** * @author  <a href="mailto:foohsinglong@gmail.com">kevin.long</a> * @description 2011-12-11 14:22:55 */public class ChangeTest {public void changeMethodA(int a, int b){System.out.println("changeMethodA交换之前\ta:"+a+"\tb:"+b);a = a + b - (b = a);System.out.println("changeMethodA交换之后\ta:"+a+"\tb:"+b);}public void changeMethodB(int a, int b){System.out.println("changeMethodB交换之前\ta:"+a+"\tb:"+b);b = a + (a = b)*0;System.out.println("changeMethodB交换之后\ta:"+a+"\tb:"+b);}public void changeMethodC(int a, int b){System.out.println("changeMethodC交换之前\ta:"+a+"\tb:"+b);a = a + b;b = a - b;a = a - b;System.out.println("changeMethodC交换之后\ta:"+a+"\tb:"+b);}public void changeMethodD(int a, int b){System.out.println("changeMethodD交换之前\ta:"+a+"\tb:"+b);a = a * b;b = a / b;a = a / b;System.out.println("changeMethodD交换之后\ta:"+a+"\tb:"+b);}public void changeMethodE(int a, int b){System.out.println("changeMethodE交换之前\ta:"+a+"\tb:"+b);a = a^b;b = a^b;a = a^b;System.out.println("changeMethodE交换之后\ta:"+a+"\tb:"+b);}public static void main(String[] args) {ChangeTest changeTest = new ChangeTest();changeTest.changeMethodA(1, 10);System.out.println("-----------------------------------");changeTest.changeMethodB(2, 9);System.out.println("-----------------------------------");changeTest.changeMethodC(3, 8);System.out.println("-----------------------------------");changeTest.changeMethodD(4, 7);System.out.println("-----------------------------------");changeTest.changeMethodE(5, 6);}}

打印内容 写道changeMethodA交换之前a:1b:10
changeMethodA交换之后a:10b:1
-----------------------------------
changeMethodB交换之前a:2b:9
changeMethodB交换之后a:9b:2
-----------------------------------
changeMethodC交换之前a:3b:8
changeMethodC交换之后a:8b:3
-----------------------------------
changeMethodD交换之前a:4b:7
changeMethodD交换之后a:7b:4
-----------------------------------
changeMethodE交换之前a:5b:6
changeMethodE交换之后a:6b:5